Unexpected Gelation Behavior of Cellulose Nanofibers Dispersed in Glycols
Unexpected Gelation Behavior of Cellulose Nanofibers Dispersed in Glycols
复制标题
分散在乙二醇中的纤维素纳米纤维的意外胶凝行为
DOI：
10.1021/acs.macromol.2c01035
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发表时间：
2022
期刊：
影响因子：
5.5
通讯作者：
Hsiao, Benjamin S.
中科院分区：
文献类型：
--
作者：
Wang, Ruifu;He, Hongrui;Sharma, Priyanka R.;Tian, Jiajun;Söderberg, L. Daniel;Rosén, Tomas;Hsiao, Benjamin S.
在本研究中，研究了 TEMPO 氧化木基纤维素纳米纤维 (CNF) 悬浮液在两种不同的二醇（乙二醇 (EG) 和丙二醇 (PG)）中在重叠浓度附近的凝胶化行为，并与水性 CNF 悬浮液的凝胶化行为进行了比较。这些非水和水性 CNF 悬浮液的流动特性通过流变学、紫外可见光和流变光学技术进行了表征。研究发现，CNF(PG)悬浮液表现出搅拌可逆的凝胶行为，只需静置（即延长保持时间）即可诱导凝胶化。然而，CNF(EG) 和 CNF(aq) 悬浮液没有观察到这种行为。较高的温度和较高的CNF浓度可以加速PG中CNF的凝胶化过程，但光学技术没有检测到大规模的相分离。我们的研究表明，PG 中 CNF 之间亲水吸引力的降低是形成富含 CNF 的微域的主要驱动力，从而产生物理交联网络。这项研究表明，溶剂的选择可用于定制和控制 CNF 悬浮液的流动行为，从而设计出适合不同应用的新型纤维素纳米复合材料。
In this study, the gelation behavior of TEMPO-oxidized wood-based cellulose nanofiber (CNF) suspensions in two different glycols, ethylene glycol (EG) and propylene glycol (PG), was investigated near the overlap concentration and compared with that of aqueous CNF suspensions. The flow property of these non-aqueous and aqueous CNF suspensions was characterized by rheological, UV–vis, and rheo-optical techniques. It was found that the CNF(PG) suspensions exhibited stirring-reversible gelation behavior, where gelation could be induced simply by resting (i.e., prolonged holding time). However, this behavior was not observed for CNF(EG) and CNF(aq) suspensions. Higher temperature and higher CNF concentration could accelerate the gelation process of CNFs in PG, but no large-scale phase separation was detected by the optical techniques. Our study suggests that the reduced hydrophilic attraction between CNFs in PG is the main driving force for forming CNF-rich micro-domains, yielding a physically crosslinked network. This study suggests that the choice of solvent can be used to tailor and control the flow behavior of CNF suspensions, leading to designs of new cellulose-enabled nanocomposites for varying applications.
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影响因子：
2.4
作者：
Chevillard, C;Axelos, MAV
通讯作者：
Axelos, MAV
影响因子：
5.5
作者：
Ruifu Wang;T. Rosén;Chengbo Zhan;S. Chodankar;Jiahui Chen;P. Sharma;S. Sharma;Tianbo Liu;B. Hsiao
通讯作者：
Ruifu Wang;T. Rosén;Chengbo Zhan;S. Chodankar;Jiahui Chen;P. Sharma;S. Sharma;Tianbo Liu;B. Hsiao
影响因子：
17.1
作者：
Rosén T;He H;Wang R;Zhan C;Chodankar S;Fall A;Aulin C;Larsson PT;Lindström T;Hsiao BS
通讯作者：
Hsiao BS
DOI：
10.1073/pnas.1710927114
发表时间：
2017-10-10
影响因子：
11.1
作者：
Perazzo, Antonio;Nunes, Janine K.;Stone, Howard A.
通讯作者：
Stone, Howard A.
影响因子：
4.7
作者：
Rosén T;Wang R;He H;Zhan C;Chodankar S;Hsiao BS
通讯作者：
Hsiao BS